Hungary



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STEAM BOILER.

m1811188 Peb. 24, 1885.

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Unire Srerns HERMANN CARL HOFFMEISTER, OF MEIDLING, NEAR VIENNA,AUSTRIA- l HUNGARY.

-BOILEFL SPECIFICATION L'orrning part of Letters Patent No. 312,718,dated February 24, 1885.

Applicationled April 5, 1884. (No model.) Patented in Germany March l,18S-2, No. 19,874; in France March 9, 1882, No. 147,804; in BelgiumMarch 9, 1882, No. 57,303; in Italy April l2, 1982, XVI, 14,103; XVIII,110; in England April :26, 1882, No.

1,968, and in Spain March "l, 1883. No. 3,34-2/3 42'?.

I'o @ZZ whom, it may concern:

Be it known that l, HERMANN CARL Honr- Mnrsrnn., a subject of theEmperor of Austria, residing in Meidling, near Vienna, in the Empire ofAustria-Hungary, have invented certain new and useful Improvements inBoilers, of which the following is a specification.

This invention relates to animproved boiler of novel construction. Theboiler consists, essentially, of ahorizontal fiat upper chamber, to thelower flat surface of which are riveted or otherwise attached the endsof a sufficient number ot' curved tubes, which hangdown into the tirebeneath the boiler, their f'ront ends being attached to the bottom plateand descending vertically for a sufficient distance, and then curvingback and up until their back ends are similarly attached to the otherend ofthe bottom plate. The tubes may be arranged so that some of theirnumber descend to a greater depth than the remainder. The plates formingthe top and bottom of the fiat chamber are riveted or otherwise attachedsufciently strongly together, the space between them being stayedv byangle-iron and other stays. The furnace below the fiat chamberdescribed, and surrounding the tubes, is preferably of cast-iron linedwith fire-brick, in which coal or other suitable fuel is burned. Achimney is provided at one end of the furnace, and at the other end is`arranged an inclined hinged door, through which the fuel is supplied,and by which the supply of air to the furnace is automaticallyregulated, as required, in the following manner:

To the upper plate of the fiat chamber described is bolted or otherwisefixed a tube or attachment having a wide-mouthed flange, upon which isfixed, by means of a corresponding external flange, a corrugatedflexible elastic diaphragm, preferably of steel or other sutticientlystrong thin metal, which will therefore be bent or bulged outward to anextent varying with the varying pressure ofthe steam behind it. rlhismovement of the diaphragm is transmitted to a central pin, which pressesupon a lever suspended to a fulcruni above, the lower end of which leveroperates upon the inclined hinged door above described,

`5o opening it and admitting air to an extent dependent upon thepressure of the steam against the diaphragm, as described. Below thefire-place is arranged an ash-pit, also closed by a hinged door, whichis connected to the inclined hinged fire-door just described by leversin such manner that in proportion as the fire-door is closed the aslrpitdoor is opened, and vice versa.

Upon the upper surface of the fiat generating-chamber first described isboltedahollow dome or pedestal, preferably of cast-iron, upon which isiitted or fixed a vertical hollow standard carrying the necessarybearings for the fiy-wheel shaft, slide-bars, and other ordinary partsofa steam-engine, the cylinder of which is bolted by its upper flange tothe top of the dome or pedestal, into which its lower part descends, soas to be surrounded with steam. The hollow standard is provided withdoors or covers, by which access is obtained to the guides and othermoving parts of the engine. The level of the water in the boiler remainsconstant, and incrustation is impossible, distilled water only beingused. The boiler is supplied in the first place through a safetyvalvefixed upon its upper surface.

The accompanying drawings are an illustration of the invention.

Figure l represents a longitudinal section, Fig. 2, a cross-section;Fig. 3, a front view, and Fig. 4 a plan of the entire apparatus.

The boiler B belongs to the class of multitubular inexplosible boilers.The main part of this boiler is fiat, and consists of the flat hood B,surrounded by an angle-iron,which is rigidly bolted to the entirely fiatbottom a.

'The furnace A is, as shown, of cast-iron, and its fire-box is fittedwith a fire-clay lining, the tubes d curved in thepeculiar form. shown,and hang down into the iire beneath the boiler, their front ends beingattachedto the bottom plate, a, and descending vertically for asufficient distance, and then curve back and up until their back endsare similarly secured to the bottom plate, a, whichis strengthened bythe angle-irons c b b.

To the angle-irons b b suitable stays are secured, the upper ends ofwhich are attached to the top plate of the hood B, and the angleiron cis attached to the under side of the fiat thelat hood B, with itsSurrounding angleiron bolted to 2in entirely Het bottom plate, d,provided with angle-ironsb b, having suitable stays attached to the topof the hood B, the angle-iron c, attached at right angle to theangle-irons b b, for strengthening the dat boiler, and the descendingtubes d, substantially its and for the purpose described.

HERMANN CARL HOFFMEIS'IER. In presence of- JAMES RILEY WEAVER, CLARENCEM. HYDE.

